TPS reading backwards in my swap
#1
TPS reading backwards in my swap
i am trying to figure out my idle issues before tuning tomorrow.
background: http://www.hptuners.com/forum/showth...6-in-a-BMW-540
TPS reads 4.98V with key on and engine off. surely this is wrong.
i am also getting 89%TPS at Key on engine off with my foot off the gas.
TPS drops to 31% with foot to the floor. throwing codes for MAP sensor which has to be getting bad readings from the high idle (2200 rpm regardless of condition).
i am hoping i just have a few TPS wires backwards. any input is appreciated as i have a tuning appointment for 1pm tomorrow and don't want to bog them down with my wiring issues.
background: http://www.hptuners.com/forum/showth...6-in-a-BMW-540
TPS reads 4.98V with key on and engine off. surely this is wrong.
i am also getting 89%TPS at Key on engine off with my foot off the gas.
TPS drops to 31% with foot to the floor. throwing codes for MAP sensor which has to be getting bad readings from the high idle (2200 rpm regardless of condition).
i am hoping i just have a few TPS wires backwards. any input is appreciated as i have a tuning appointment for 1pm tomorrow and don't want to bog them down with my wiring issues.
#3
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#8
TECH Senior Member
iTrader: (7)
I've never heard of LS TPS sensors having to be calibrates. You probably have the power and ground crossed. Once you flip the leads, the sensor will be calibrated automatically at start up.
Andrew
Andrew
#9
shortly after posting this thread i thought about the logic of my problem and looked at the pinout again. signal, low reference, and 5V reference. i swapped the 5V reference and low reference and the inverse problem was solved. now had 6% to 60% from no throttle to WOT, which was good, but the range was not big enough. even after recalibrating (reset) the TPS and making sure everything was connected correctly, still had 60% at WOT. turns out the Express Van TB has what seems like a thicker cast aluminum stop for WOT, so i machined down that stop little by little until we were getting better readings. final result was about 4% to 95%, and started tuning from there.
made 370whp/374tq
made 370whp/374tq